Great For the TM MK23
I have 3 TM mags and run them on propane/Green Gas (not made ONLY 134a) and average about 310 fps on a full gas fill. these mags here Must have a weaker valve spring because when I run these, my FPS jumps to close to 350, and i can only assume its a weaker valve spring allowing more gas to be expelled from the mag with the same amount of force from the hammer. but that's purely speculation. either way. 1/2 the cost and a little more power, You Can't Beat Them!

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